Window's on the Universe - BooNE - Fermilab
Transcript of Window's on the Universe - BooNE - Fermilab
MiniBooNE“Windows on the Universe”
Ray StefanskiFermilab
Blois 2009 Windows on the UniverseJune 22, 2009
Outline:
Introduction
Current Status
New Results
Expectations
Summary
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Introduction
:ncedisappeara
:appearance
sexperiment noscillatio
e
e
MiniBooNE
SciBooNE
accelerator sourcesstopped muons @ LANL -> LSNDBNB @ FNAL -> MiniBooNE
-> SciBooNENuMI @ FNAL -> MINOS
-> NOVA-> MiniBooNE
Liquid Scintillator Neutrino Detector (LSND)
3 active families2 or more sterile s
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A.A. Aguilar et al., Phys. Rev. D 64 (2001) 112007E. Church et al., Phys. Rev. D 66, 013001 (2002)
Introduction
A 3.8 s signal at Dm2 ~ 0.6 eV2 @ sin2(2q) ~0.001
Liquid Scintillator Neutrino Detector (LSND)
detetctor Cowen a Reines, like much
capture. neutrino from detected
background from eliminated nsinteractio
:ssystematic of controlExcellent
e
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distribution for data (points with statistical errors) and backgrounds (histogram with systematic errors).Note that range begins at 0.2 GeV.There is a clear low-energy excess in the data.
QEE
QEE
Aguilar-Arevalo al., Phys. Rev. Lett. 98, 231801 (2007)Data are available on-line.Aguilar-Arevalo et al., Phys. Rev. D 78, 012007 (2008)
Current Status
Summed 2D Dc2 compatibilitygrid from LSND, KARMEN2, MiniBooNE and Bugey. Thestar indicates the point ofmaximal compatibility (3.94%).
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Aguilar-Arevalo et al.. Phys. Rev. Lett. 102, 101802 (2009)
The distribution for CCQE data(points with statistical errors) and background (histogram with unconstrained systematic errors).
eQEE
Constraints on models now include:~50 MeV excess in mode~350 MeV excess in modeNo excess at ~350MeV in mode.
Current Status
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Harvey, Hill & Hill, [hep-ph/0708.1281] (2007)
A potential explanation of thelow energy anomaly withinthe standard model: an application of the axial vectoranomaly to radiativeneutrino scattering, wherethe radiated photon mimicsan electron in MiniBooNE
Triangle diagram at chiral constituentquark level treating , Z, w as backgroundgauge fields.
This approach is disfavored,because it doesn’t distinguishbetween and
Current Status
MiniBooNE has produced many results that we wish to explore within the
context of “Windows on the Universe.” We need a phenomenological basis or
backbone for MiniBooNE’s contributions.
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“Altered Dispersion Relations or ADRs are due to the ... interaction of neutrinos with background fields and particles, or are attributable to ... CPT- violating extensions of the Standard Model, or ... additional space-time dimensions. “ They are of interest in exploring the interactions of active-sterile neutrinos.
Hollenberg and Pas, hep-ph/0904.21011
Current Status
MiniBooNE does not test for matter effects, but resonantfeatures within the context of ADRs could have observables accessible to short-baseline neutrino experiments.
Examples of such theories that depend on sterile neutrinos and are the familiar physical territory of MiniBooNE:a. extra dimensional shortcuts
– in which sterile neutrinos can propagate in an other dimensionb. or theories in which Lorentz invariance is broken and CPT might be violated.
We’ll also refer explicitly to a 3+2 scenario: models with 3 active and 2 sterile neutrinos that consolodate existing data
LSND
MiniBooNEEnergythreshold
Eres=200 MeV
300 MeV
400MeV
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Pas, Pakvasa & Weirler, Phys Rev D 72, 090517 (2005)
An example of extra dimensional shortcuts leadingto resonant oscillation behavior that might explainthe MiniBooNE low energy effect.
eV 0.8 eV 0.8 m
0.006 0.45 2sin
0.1 1.0 sin
LSND MiniBooNE
2
2
*
2
q
to e oscillation analysis and the low energy excess
In the context of ADRs, this resonant effect can occur only within a normal hierarchy, and the LSND effectwould be larger than the effect in the neutrino sector.
Current Status
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Hollenberg and Pas, hep-ph/0904.21011
We analyzed the consequences of our model in the context of LSND and MiniBooNE oscillation anomalies: ... using potentials generated by Lorentz symmetry violation the ...data might ...be explained via non-standard matter effects. Matter effects .. due toStandard Model weak interactions are negligible at sub-GeV energies.....but new interactions in Standard Model extensions could give rise to non-standard matter effects affecting the analysis of these ...experiments. Such non-standard matter effects could reduce the widths of resonance peaks and shift the resonance energiesof neutrinos with respect to the resonance energies of anti-neutrinos,thus improving data fits for ADR solutions to the LSND and MiniBooNE anomalies.
Current Status
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MiniBooNE
SciiBooNE
&
the NuMI target
New Results
MiniBooNEtarget
Minos neardetector
beam stops
SciBooNE
MiniBooNE
decay region
NuMItarget
Distances are cumulativetotals along the beam lines.
Elevation is not shown, but the MiniBooNE detector lies atan angle of 6.3 degrees relative to the NuMI axis.
& disappearance search
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Sensitivity (dashed line) and limit (solid line) for 90% CL for & disappearance.
Aguilar-Arevalo etal. hep-ex/0903.2465.
)X/X/()X/X(" Define
/for
and iniBooNESciBooNE/Mfor
targeton protonper events CCQE X /
/
SMSM
MS
R
If CPT is conserved in the neutrino sector, this double ratio will be identically equal to unity withinstatistical and systematic effects.
New Results
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MB “disappearance” result rules out thebest-fit point
Allowed regions for globaldata in (3+2) schemes inthe planes , with all other parameters minimized.
2
51
2
41 & mm DD
to e oscillation analysis and the low energy excess
Maltoni & Schwetz, Phys. Rev. D 76 093005 (2007)Karagiorgi et al. hep-ph/0609177 (2007)
Expected oscillation probabilities atMiniBooNE in & running modes. The model is consistent with the MiniBooNE results. (G. Karagiorgi et al.)
& disappearance search
New Results
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Aguilar-Arevalo et al. Phys. Rev. Lett. 102, 211801 (2009)
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Expectations
NuMI
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Summary
MiniBooNE results act as constraintsfor a variety of models, including those built on Altered Dispersion Relations using sterile neutrinos
Additional running in antineutrino mode will clarify thedistinction between the low energy excess for
Combined analysis from SciBooNE and MiniBooNE will furtherclarify the disappearance results and may offer a directtest of CPT invariance.
Further analysis with data from the NuMI beam and analysisusing timing techniques will also add to our visionthrough “Windows on the Universe.”
. and